Bioavailability Of Trace Elements In The Human Body And Associated Elements

Protein, fat, sugar, vitamin and essential trace elements are all vitally important nutrients in maintaining the normal activities of human being. Protein, fat and sugar supply the energy that the body needs. The essential trace elements play very important roles in keeping the whole microcircular system of body working normally. More and more people have attached importance to the deficiency of trace elements. It is shown that the elemental deficiencies not only have relation to the daily intake but also to the absorption ratios. So the bioavailabilities of some essential trace elements were studied in this work. The absorption ratios of zinc in children who are zinc- deficiency and iron in healthy women were studied, respectively. The activable enriched isotopes were used as tracers to follow the path of elements. In order to check the reliability of our results, AAS as well as NAA was used. By taking into account both the endogenous contribution and intake contribution , more reasonable results were obtained. Moreover, the relationships among elements were studied by NAA. Preliminary findings include the following:(1) Under the fixed dietry, the absorptional activity has relationship with intaken mode. Balanced intake mode gives the highest absorption.(2) Among the 3 groups of children tested, the highest Zn bioavailibility is 33.9%, the uncertainty is 6.3%.(3) The bioavailibility of iron in healthy women vary from 10% to 22%, and the uncertainty is 3.77%.(4) Insufficent intake of essential trace elements is harmful to the growth of bone. (5)The intakes of Zn, Cu, Mn have little influence to the absorption of Ca.However, high intake of Ca could reduce the absorption of some essential elements.